I especially notice this with iOS. iPhone OS (back when it was called that) was a masterpiece of design with every app having its own, different personality while being simple & efficient to use.

The last few iOS releases are a disaster on both fronts. Design-wise it’s completely blank, flat & empty, and usability wise a lot of the apps are just shadows of their former selves. Music, messages, maps, App Store, podcasts, etc. Even basic text editing was downgraded.